Aldarc
Legend
Giving this more thought, I realized that we can frame the OP's premise in a different way that is perhaps more revealing for our discussion. We can say that the primary function of the cleric is to be a holy warrior. This vision of the cleric is certainly the ideal, but it rarely works out this way in practice. We see this by asking a different question: Why are people reluctant to play clerics? Are people reluctant to play a cleric because they do not want to play a holy warrior? Sometimes, this response would be true for those who don't want their characters serving gods or religions, but this response is not as common as others in discussions of clerics. Instead, the most frequent response to the question is a variation of "People do not want to play the healer." While we may envision the primary function of the cleric foremost as a holy warrior, as per the ideal, the frequent reluctance to play clerics* suggests that the healing metafunction takes precedent in practice.
* (I don't care about your exception to the greater observed and document trend. We get it. You and your group are a bunch of special snowflakes.)
* (I don't care about your exception to the greater observed and document trend. We get it. You and your group are a bunch of special snowflakes.)